Climate change is real and it is happening and I do believe that is by human-caused but there are always two different sides to this. Some people feel that climate change is happening while others think climate change is not real as we´d like to think.

Surface temperature measurements show a global warming period from about 1910 to 1950, followed by a cooling period until 1975. Since then we have experienced a warming trend. These three periods add up to a surface temperature increase of perhaps one degree Fahrenheit for the entire 20th century.

Scientist believes that from 1960-2000 temperature has increased greatly.
So whether man-made carbon dioxide emission have made the temperature increase over the last century is a huge debate not only for scientist but for politicians as well. Global warming has become a political debate